Date: Sat, 14 Apr 2012 16:41:52 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Hajimu UMEMOTO <ume@FreeBSD.org> Cc: freebsd-net@FreeBSD.org, Rainer Bredehorn <Bredehorn@gmx.de>, Andrew Thompson <thompsa@FreeBSD.org> Subject: Re: getifaddrs & ipv6 scope Message-ID: <7153D609-0E71-435A-B076-27BD6C3AEA04@lists.zabbadoz.net> In-Reply-To: <yged37becg7.wl%ume@mahoroba.org> References: <20120413064142.10640@gmx.net> <CAFAOGNRLcadCMCZ8WjaFi3XYhzV55Tp0v=%2BoMGyLOv666bFHkA@mail.gmail.com> <yged37becg7.wl%ume@mahoroba.org>
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On 13. Apr 2012, at 18:03 , Hajimu UMEMOTO wrote: > Hi, >=20 >>>>>> On Fri, 13 Apr 2012 20:01:39 +1200 >>>>>> Andrew Thompson <thompsa@FreeBSD.org> said: >=20 > thompsa> On 13 April 2012 18:41, Rainer Bredehorn <Bredehorn@gmx.de> = wrote: >> Hi! >>=20 >>> I have noticed that getifaddrs() does not have sin6_scope_id set to >>> the interface id for link local addresses on AF_INET6 types. Running >>> the following program gives different results on Linux >>=20 >> ifconfig shows the scopeid according to the interface: >>=20 >> inet6 fe80::208:9bff:fe13:784e%fxp1 prefixlen 64 scopeid 0x2 >>=20 >> Are you talking about the scope value of an multicast address or >> the scopeid for link local addresses? >=20 > thompsa> I am talking about the scopeid for link local addresses which = (as far > thompsa> as I understand) is the interface index. >=20 > The issue you mentioned comes from an implementation decision of the > KAME IPv6 stack. > The attached patch should address it. However, it may break the > applications which expect that getifaddrs() returns a link-local > address with KAME's embeded scopeid representation. I'm not sure > there are such applications, for now. There should be none. If we have some we should fix them. I wonder if = this should actually be done in the kernel to limit the scope of the = embedded scopeid to our kernel for now? Do we have other interfaces = (ignoring kvm) that export the embedded scopeid? /bz --=20 Bjoern A. Zeeb You have to have visions! It does not matter how good you are. It matters what good you do!
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